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| Joined: | 09-17-2007 |
| Location: | San Francisco, California USA |
| Posts: | 221 |
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With 36mm chokes I was not able to really approach anything beyond 6000rpm, or the engine felt "floaty" at those rpms.
Decided to try something I had never thought of before - using some 40mm chokes just to compare. I had them rolling around in a box for years and surprisingly, given the same jet setup with the 120 mains and 170 AC's and F4 Emulsions, it runs relatively the same. The higher rpm's feel more approachable now and it's pulling past 6500.
But this still seems odd to me given the 104 cams and how this is really supposed to be shinning in the higher RPM's. At a loss to explain the different phenomena:
1) Regardless of setup, she seems to need the 55F9's and the F4 Emulsions to run well at all
2) 120 mains seems so lean, but she still reads rich
3) Regardless of chokes, 36, 38, or 40mm the only difference is higher rpm limit
4) Still kind of a rough transition but then a lack of top end performance in terms of WOT sluggishness and slow response
Messed with some timing today, gave it some more advance. Will try the 110 mains in the near future.
Good A/F ratio though:
Idle 13.5 to 1
Cruise 3000 rpm 13.5 to 1
Cruise 6000 rom 12.5 to 1
WOT 11 to 1
50% throttle 12 to 1